The following holders have notified Tenaris of holdings in excess of 5% of its voting rights:
HOLDER: San Faustín S.A.
NUMBER OF SHARES: 713,605,187
PERCENTAGE OF SHARE CAPITAL: 66.57
PERCENTAGE OF VOTING RIGHTS: 67.43 (*)
San Faustin owns all of its shares in the Company through its wholly-owned subsidiary Techint Holdings S.à r.l. The Dutch private foundation (Stichting) Rocca & Partners Stichting Administratiekantoor Aandelen San Faustin ("RP STAK") holds voting shares in San Faustin sufficient in number to influence matters affecting or submitted to a vote of the shareholders of San Faustin S.A., including the election of directors and the approval of certain corporate transactions and other matters concerning San Faustin S.A.'s policies. No person or group of persons controls RP STAK.
(*) The percent of voting rights is calculated based on 1,071,994,930 issued shares, of which 13,694,268 were held by Tenaris S.A. as treasury stock as of June 27, 2025. Such shares were repurchased under the Company’s Share Buyback Program to be cancelled in due course and the voting rights attaching to such shares will remain suspended pending cancellation.